In that experiment, Ledoux conditioned rats to fear a bell by ringing it in time with anelectric shock until the rats froze in fear at the mere sound of thebell.

试验中，勒杜按时闹铃并且电击老鼠直到它们一听到铃声就吓得僵住。

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An LCD does not emit light of its own. Rather, it consists of crystal molecules. Anelectric field causes the molecules to line up in a way that alters their optical properties.

液晶显示自己不发射光，相反，是由晶体分子组成，电场使得这些分子排成一行，在某种程度上改变着它们的光学特性。

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